2564747447 has 4 divisors (see below), whose sum is σ = 2581083576. Its totient is φ = 2548411320.

The previous prime is 2564747431. The next prime is 2564747489. The reversal of 2564747447 is 7447474652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2564747447 - 2⁴ = 2564747431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2564747395 and 2564747404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564747417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8167829 + ... + 8168142.

It is an arithmetic number, because the mean of its divisors is an integer number (645270894).

Almost surely, 2^2564747447 is an apocalyptic number.

2564747447 is a deficient number, since it is larger than the sum of its proper divisors (16336129).

2564747447 is a wasteful number, since it uses less digits than its factorization.

2564747447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16336128.

The product of its digits is 5268480, while the sum is 50.

The square root of 2564747447 is about 50643.3356622567. The cubic root of 2564747447 is about 1368.8258622507.

The spelling of 2564747447 in words is "two billion, five hundred sixty-four million, seven hundred forty-seven thousand, four hundred forty-seven".